/**
 * Element test/unit/util.js
 */
import Vue from 'vue'
import MuseUI from 'muse-ui'

Vue.use(MuseUI)

let id = 0

const createElm = function () {
  const elm = document.createElement('div')

  elm.id = 'app' + ++id
  document.body.appendChild(elm)

  return elm
}

/**
 * 回收 vm
 * @param  {Object} vm
 */
exports.destroyVM = function (vm) {
  vm.$el &&
  vm.$el.parentNode &&
  vm.$el.parentNode.removeChild(vm.$el)
}

/**
 * 创建一个 Vue 的实例对象
 * @param  {Object|String}  Compo   组件配置，可直接传 template
 * @param  {Boolean=false} mounted 是否添加到 DOM 上
 * @return {Object} vm
 */
exports.createVue = function (Compo, mounted = false) {
  const elm = createElm()

  if (Object.prototype.toString.call(Compo) === '[object String]') {
    Compo = { template: Compo }
  }
  return new Vue(Compo).$mount(mounted === false ? null : elm)
}

/**
 * 创建一个测试组件实例
 * @link http://vuejs.org/guide/unit-testing.html#Writing-Testable-Components
 * @param  {Object}  Compo          - 组件对象
 * @param  {Object}  propsData      - props 数据
 * @param  {Boolean=false} mounted  - 是否添加到 DOM 上
 * @return {Object} vm
 */
exports.createTest = function (Compo, propsData = {}, mounted = false) {
  if (propsData === true || propsData === false) {
    mounted = propsData
    propsData = {}
  }
  const elm = createElm()
  const Ctor = Vue.extend(Compo)
  return new Ctor({ propsData }).$mount(mounted === false ? null : elm)
}

/**
 * 触发一个事件
 * mouseenter, mouseleave, mouseover, keyup, change, click 等
 * @param  {Element} elm
 * @param  {String} name
 * @param  {*} opts
 */
exports.triggerEvent = function (elm, name, ...opts) {
  let eventName

  if (/^mouse|click/.test(name)) {
    eventName = 'MouseEvents'
  } else if (/^key/.test(name)) {
    eventName = 'KeyboardEvent'
  } else {
    eventName = 'HTMLEvents'
  }
  const evt = document.createEvent(eventName)

  evt.initEvent(name, ...opts)
  elm.dispatchEvent
    ? elm.dispatchEvent(evt)
    : elm.fireEvent('on' + name, evt)

  return elm
}
